The top500.org site is owned and operated by ... top500.org, a private registry with Network Solutions, Inc.

The site claims four authors by name who are employed by the University of Mannheim, Lawrence Berkeley National Laboratory, and the University of Tennessee.

The site says they use the results of LINPACK benchmarks to compile their list.

Wikipedia states without citation that LINPACK "...has been largely superseded by LAPACK which runs more efficiently on modern architectures."

From my perspective, the author of the ZDnet article defined neither "best" nor "fastest" -- the first term was both normative and meaningless, the second required digging elsewhere to determine its meaning and at least one Wikipedia author considers outdated. Further research will require comparisons between LAPACK and LINPACK, which I will leave to you because as I stated above, I don't care about this at all.